ERBB2 and neoplasm: In Fig. 4, the results are shown by tumour subtype: hormone receptor-positive/HER2-negative (Fig. 4a: log-rank P value = 0.041), hormone receptor-positive/HER2-positive (Fig. 4b: log-rank P value = 0.212), hormone receptor-negative/HER2-positive (Fig. 4c: log-rank P value = 0.055) and hormone receptor-negative/HER2-negative (Fig. 4d: log-rank P value = 0.0046).